Novel mechanism for the Nafion membrane transfer of anthraquinones

Autor:	J. Samp, Q.X. Hou, X.-S. Chai
Rok vydání:	2006
Předmět:	Hydroquinone Chemistry Filtration and Separation Nafion membrane Permeation Photochemistry Biochemistry Anthraquinone Acceptor chemistry.chemical_compound Membrane Anthraquinones Organic chemistry Lignin General Materials Science Physical and Theoretical Chemistry
Zdroj:	Journal of Membrane Science. 271:215-220
ISSN:	0376-7388
DOI:	10.1016/j.memsci.2005.07.020
Popis:	The observed special behavior of anthraquinone and its derivatives in a Nafion membrane system is reported here. It is observed that anthraquinone (AQ) in aqueous suspension can diffuse through a Nafion membrane if there is a strongly reducing species on the acceptor side of the membrane. In order to explore this phenomenon, the authors use hydroquinone and soluble derivatives of AQ as models. It is shown that the reduction to the hydroquinone form increases the separation coefficient of the species above that expected by its molecular weight. Therefore, AQ must be a special exception as it can only diffuse through the membrane if it is first reduced to the corresponding anthrahydroquinone (AHQ) form. It is shown that a very high surface concentration of AHQ is responsible for the measurable permeation of the membrane by AQ species. The enhancement of membrane transfer by addition of dissolved wood lignin is also explored.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::147335c87bd2f69998266deb875f5f29 https://doi.org/10.1016/j.memsci.2005.07.020 Zobrazit plný text záznamu Full Text from ScienceDirect